FACULTY OF ENGINEERING & TECHNOLOGY
Mr. Dilip Kumar J Saini
Assistant Professor
Computer Science & Engineering
Lecture- 32
DCS-503 Computer Networks
OUTLINE
OVERVIEW OF NOS CHARACTERISTICS
DIFFERENCES BETWEEN PC AND A NOS
MULTIUSER, MULTITASKING, AND MULTIPROCESSOR SYSTEMS
CHOOSING A NOS
TYPES OF NOS
OVERVIEW OF NOS CHARACTERISTICS
Network operating systems (NOSs) distribute their functions over a number of networked computers.
It then adds functions that allow access to shared resources by a number of users concurrently.
NOS computers take on specialized roles to accomplish concurrent access to shared resources.
Client systems contain specialized software that allows them to request shared resources that are controlled by server systems responding to a client request
DIFFERENCES BETWEEN PC AND A NOS
The NOS enhances the reach of the client PC by making remote services available as extensions of the local native
operating system.
Although a number of users may have accounts on a PC, only a single account is active on the system at any given time.
NOS supports multiple user accounts at the same time and enables concurrent access to shared resources by multiple clients (multitasking and multiuser environment).
MULTIUSER, MULTITASKING, AND MULTIPROCESSOR SYSTEMS
A NOS server is a multitasking system. Internally, the OS must be capable of executing multiple tasks or processes at
the same time.
Some systems are equipped with more than one processor, called multiprocessing systems.
They are capable of executing multiple tasks in parallel by assigning each task to a different processor.
The aggregate amount of work that the server can perform in a given time is greatly enhanced in multiprocessor systems
CHOOSING A NOS
The main features to consider when selecting a NOS include:
Performance
Management and monitoring tools Security
Scalability
Robustness/fault tolerance
TYPES OF NOS
It is important to know the basics about popular NOS families.
Many networks now include more than one server type, and
knowing how to get these diverse systems to interoperate is an important skill for a network administrator.
Operating systems on the network have their own language.
Different NOS vendors use the same terms in different ways.
Multiple Choice Question
MUTIPLE CHOICE QUESTIONS
:Sr no Question Option A Option B OptionC OptionD
1
Host-specific routing is used for purposes such as checking route or providing _____
Network Measures
Security Measures
Delivery Measures
Routing Measures
2
In Unicast routing, if instability is between three nodes,
stability cannot be ________ Stable Reversed Guaranteed Forward
3
In Unicast Routing, Dijkstra algorithm creates a shortest
path tree from a ________ Graph Tree Network Link
4
n Multicast Routing Protocol, flooding is used to broadcast
packets but it creates ________ Gaps Loops Holes Links
5
RPF stands for __________ Reverse Path
Forwarding
Reverse Path Failure
Reverse Packet Forwarding
Reverse Protocol Failure
REFERENCES
http://www.engppt.com/2009/12/networking-fourozan-ppt-slides.html
